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  <title>删除之前设置的 HTTP 头</title>
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    <li>删除之前设置的 HTTP 头</li>
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<div id="layout">
  <div id="layout-content"><div id="function.header-remove" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">header_remove</h1>
  <p class="verinfo">(PHP 5 &gt;= 5.3.0, PHP 7, PHP 8)</p><p class="refpurpose"><span class="refname">header_remove</span> &mdash; <span class="dc-title">删除之前设置的 HTTP 头</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-function.header-remove-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>header_remove</strong></span>(<span class="methodparam"><span class="type">?</span><span class="type"><span class="type">string</span><span class="type"></span></span> <code class="parameter">$name</code><span class="initializer"> = <strong><code>null</code></strong></span></span>): <span class="type"><span class="type void">void</span></span></div>

  <p class="para rdfs-comment">
   删除之前用 <span class="function"><a href="function.header.html" class="function">header()</a></span> 设置的 HTTP 头。
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.header-remove-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>
    
     <dt>
<code class="parameter">name</code></dt>

     <dd>

      <p class="para">
       要移除的头名称。当为 <strong><code>null</code></strong>，移除之前设置的所有 header。
      </p>
      <blockquote class="note"><p><strong class="note">注意</strong>: 
       <span class="simpara">
        参数不分大小写。
       </span>
      </p></blockquote>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.header-remove-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   没有返回值。
  </p>
 </div>


 <div class="refsect1 changelog" id="refsect1-function.header-remove-changelog">
  <h3 class="title">更新日志</h3>
  <table class="doctable informaltable">
   
    <thead>
     <tr>
      <th>版本</th>
      <th>说明</th>
     </tr>

    </thead>

    <tbody class="tbody">
     <tr>
      <td>8.0.0</td>
      <td>
       <code class="parameter">name</code> 现在允许为 null。
      </td>
     </tr>

    </tbody>
   
  </table>

 </div>


 <div class="refsect1 examples" id="refsect1-function.header-remove-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-4435">
    <p><strong>示例 #1 取消指定的头</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />header</span><span style="color: #007700">(</span><span style="color: #DD0000">"X-Foo:&nbsp;Bar"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">header</span><span style="color: #007700">(</span><span style="color: #DD0000">"X-Bar:&nbsp;Baz"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">header_remove</span><span style="color: #007700">(</span><span style="color: #DD0000">"X-Foo"</span><span style="color: #007700">);&nbsp;<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程的输出类似于：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
X-Bar: Baz
</pre></div>
    </div>
   </div>
   <div class="example" id="example-4436">
    <p><strong>示例 #2 取消之前全部指定的头</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />header</span><span style="color: #007700">(</span><span style="color: #DD0000">"X-Foo:&nbsp;Bar"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">header</span><span style="color: #007700">(</span><span style="color: #DD0000">"X-Bar:&nbsp;Baz"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">header_remove</span><span style="color: #007700">();&nbsp;<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程的输出类似于：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
</pre></div>
    </div>
   </div>
  </p>
 </div>


 <div class="refsect1 notes" id="refsect1-function.header-remove-notes">
  <h3 class="title">注释</h3>
  <div class="caution"><strong class="caution">警告</strong>
   <p class="para">
    本函数会删除<em class="emphasis">所有</em> PHP 设置的头，
    包括 Cookie、Session 和 <code class="literal">X-Powered-By</code>。
   </p>
  </div>
  <blockquote class="note"><p><strong class="note">注意</strong>: 
<p class="para">
 数据头只会在SAPI支持时得到处理和输出。
</p>
</p></blockquote>

 </div>


 <div class="refsect1 seealso" id="refsect1-function.header-remove-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.header.html" class="function" rel="rdfs-seeAlso">header()</a> - 发送原生 HTTP 头</span></li>
    <li class="member"><span class="function"><a href="function.headers-sent.html" class="function" rel="rdfs-seeAlso">headers_sent()</a> - 检测消息头是否已经发送</span></li>
   </ul>
  </p>
 </div>


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